Valve mechanism for explosive-engine.



W. D. KELLY. VALVE MECHANISM FOR EXPLOSIVE ENGINES.

APPLICATION FILED SEPT, 19, 1912.

Patented Sept. 30, 1913.

WITNESSES I monmavs "WILLIAM D. KELLY, 0E BEECHWOOIQ PARK, PENN$YLVANIA.

VALVE MECHANISM FOR EXILOfiVE ENGINES.

Specification of Letters Patent.

Patented Sept. 30*, 1913.

Application filed September 1;), 1912. Serial No. 721,123.

To all whom it may concern:

Be it known that I, WILLIAM D. KELLY, a citizen of the United States,residing at BeechwoodPar-k, county of Delaware, State of Pennsylvania,have invented a new and useful Valve Mechanism for ExplosiveEnr gines,of which the following is a specification.

This invention relates to puppet valves ffl' explosive engines, and moreparticularly to mechanically'operated inlet and exhaust vala s, and hasfor an object to provide a means for positively and accurately openingand closing a valve at the proper time in thescycle' of operations andeliminating the use of a spring for effecting movement in one directionof the valve.

In gas engine valves as heretofore devised, a spring or springs havebeen necessary as an adjunct to close the valveafter the same has beenopened-either by 'suctiO-n or. by mechanical means, and in practice ithas been found at high speeds the action of the i spr ng or springs hasnot been satisfactory 5 cut preferredby me, since the same andthere is alag or floating which seriously affects the efliciency of thQlJlOlZOI.This lag is apparenteven in new springs and grad ually increases andbecomes more and more aserious factor as the springs weaken throu h useor the temper of the spring va ries t rough its exposure to the highternperature of the exhaust. Where the spring has become too weak toseat the valve quickly and in its proper relation to the cycle, a partof the charge drawn into the cylinder is forced out again and isfrequently the cause of back firing, and this latter defect is equallytrue through failure of the exhaust, valve to seat- By my presentinvention I have overcome the foregoing defects and provided a structurewherein the valve, in either of its movements, is mechanically operatedthere.- by making its operation positive and effective for the purposeintended, and by means pf which gumming of the valve stemor spindie willhave no efiect on its proper actuation.

Itfurther consists of other novel features of construction, all as willbe hereinafter fully set forth.

For the purpose of illustrating my inven tion, I have fliown in theaccompanying drawings one form thereof which is at preshas been found inand guide a moving of-gas or exhaust of w practice to give satisfactoryand reliable results, although it is to be understood that the variousinstrumeutalities of which my invention consists can be variouslyarranged and organized and that my invention is not limited to theprecise arrangement and organization of these instrumentalities asherein shown and described.

Referring to the drawings :Figure 1 represents a-vertical section of avalve op erating mechanism, embodying my invention. Fig. 2 represents aside elevation partly insection of a portion of the mechanism shown inFig. 1. Fig. 3 represents a section on line a2-a7, Fig. 1. Fig. 4represents a plan of the cam controlling the opening of the valve. Fig.5 represents a. s1de elevation of one of the cams for con.

trolling the closing movement of the valve.

Similar numerals of reference indicate corresponding parts in thefigures.

-1 designates a cap adapted to be fixedly secured to the crank case orother suitable part of an engine casing, and the same is preferablyprovided wit a rectangular or other polygonal shaped opening 2 toreceive part of the mechanism, and prevent relative rotation of theparts.

3 designates the valve proper and the same is here shown as seated inthe opening 4, of the valve chest which controls the admission asteproducts from the engine The valve 3 is fixedly carried by the stem 5,which, in the present instance, is provided with a threaded portion 6,upon which an. internally threaded sleeve 7 is can ried. This sleeveserves to adjustably secure the valve stem 5 to the operating spindle 8,

which it will be noted is oppositely threaded.

with respect to the valve stem 5, as shown at 9, thereby permittingsuitable adjustment of the valve by varying the length of its oporatingadjuncts, Suit-able lock nuts 10 are pro vided at each end of thesleeve? to maintain the desired adjustment. The operating spindle 8passes through and interior-1y of a guide member 11 located in theopening 2 and having an extension 12 projecting through an opening inthe top of the cap 1, and it will be noted that the said cap is providedwith an exterior boss 13 whichforms a suitable bearing for thereciprocation of the hollow guide extension 12. The member 11, in thepresent instance, is threaded into a head 14, and forms a part thereof,as shown at 15, and the head 14. is connected to a suitable operatingmechanism for reciprocation within the cap 1. The head 14 is bored outto a depth greater than the thickness of the member 11, in order to forma chamber 16 within which is located a coiled spring 17, having ahearing at one end against the guide member 11, which has seats 18 forthe purpose, and at the other end against a collar or abutment 19,either integral with or fixedly secured to the spindle 8. The head 14 isalso drilled to form a uide passage 20 in alincment with the spintle 8and within which the end 21 of the said'spindle is located and serves tomaintain the parts in operative position.

22 designates the timing shaft, of an explosive engine, suitably mountedfor rotation and connected to its operating parts (not shown) andcarries a cam 23. the center of which is preferably alined with the axisof the spindle 8. This cam 23 is provided with an actuating surface 24."and a face 25 which does not engage or cohtactwith the part actuatedby the cam or other parts.

26 designates a cam roller suitably mounted on ball or roller bearings27 carried by a cup 28, fixed in any suitable manner to a pin 29, thelatter being connected at each end to a bifurcated or slotted member 30,carried by the head 14 through the medium of threaded studs 31 and nuts32. These members 30 as will be apparent are slotted in' order tostraddle the shaft 22 and provide for proper operation of the parts. Itwill thus be seen as the shaft 22 rotates the cam 23, at certain times,will contact with the roller 26 and move the members 30 in onedirection, thereby shifting the head 14 with its attached parts. Thehead 14, in the present instance is moved in the opposite direct-ion, bymeans of a pair of earns 33, also carried by the shaft 22, and disposedon oppositesides of the cam 23, each being adapted to contact with aface 34, preferably curved, forming a part of the head 14, and it willthus be obvious'as the shaft 22 revolves that the cams 33 willintermittently engage the faces 34 and raise the head 14. This action istransmitted through the spindle 8 to the valve 3,

- the function of which is to permit the spring 17 to come into play,after the valve 3 has been closed and the cam 23 has moved toinoperative position, in order to exert the proper pressure to maintainthe valve closed or seated until the required time for opening the sameagain. It will also be noted that I prefer to provide a plurality ofgraduations 36, on the spindle 8, adjacent the point where it projectsfrom the guide extension 12 so that a definite or predeterminedadjustment of the valve 3 is made possible. I

In the operation of the valve mechanism, the timing shaft 22 is ofcourse revolving thus rotating the cams 23 and 33 to alternatelyshiftthe valve controlling mechanism. The cams 33 engage the surfaces34, and shift the head 14 upwardly within the guide cap 1 which causesthe collar 19 to be picked up thus transmitting movement to the valvestem 5 and opening the valve 3, while the spring 17 remains in normalposition owing to the fact that it' also moves with the head 14. As soonas the earns 33 have passed out of engagement with the surfaces 34, thecam 23 rotates into engagement with the ball-bearing cam roller 26 tocause the head to return, this movement being transmitted to the valvewhich is of course closed, and it will be noted that the design of thecam 23 is such that as soon as the valve-3 closed the surface 25 comesinto juxtaposed relation with the roller 26 but does not contacttherewith, so that at this instant the sprin 17 comes into play andyieldinglyholds th It will further be noted that I preferably provide'aclearance space between the cams and the head, as shown at 37, in. orderthat either set of cams may operate freely and independently thusreducing friction and chance of interference.

It will now be apparent that I have devised an operating mechanism for agas engine valve, which is simple in construction, efficient inoperation and positively controls the movement of the valve in eitherdirection of its movement. The advantage of this construction will bereadily apparent to those skilled in the art, since thereby the valveaccurately e valve 3 to its seat.

regulates the admission and exhaust of gases,

while the engine is running athigh speed, and there is therefore no lagor floating of the valve due to springs controlling them and the openingand closing movements positively take place at the proper time in.

the cycle. A further distinct advantage resides in the fact that thereareno springs located in the vicinity of the hot gases, and thereforethis cause of defective valve operation is eliminated.

It will now be apparent that I have (is vised a novel and usefulconstruction of a valve mechanism for explosive 611511188,-

which embodies the features of advantage enumerated as desirable in thestatementof the invention andthe above description, and

while I have.,in the present instance, shown and described a preferredembodiment thereof which has been found in practice to givesatisfactory. and reliable results, it is to be understood that the sameis susceptible of modification in various particulars without departingfrom the spirit or scope of the invention or sacrificing any of itsadvantages. Having thus described my invention, what I claim as new anddesire to' secure by Let ters Patent, is

1. In a device of the character stated, a

valve, a timing shaft rotatably mounted in operative relation thereto, ahead, means to guide said head, a spindle connected to said valve andfreely movable Within said'head, a plurality of cams fixedly carried bysaid shaft, means carried by said head and alternately actuated by saidcams for moving said head t0 shift said spindle to open and close saidvalve, and means coacting with said spindle for maintaining said valveseated after a closing action.

2. In a device of the character stated, a valve, a spindle connected tosaid valve, a head torminga guide forsaid spindle, an abutment'carriedby saidspindle and normally out of contact with said head and in thepath of movement thereof, a casing forming a guide for said head, aguide member carried by. said head, yielding means between said guidemember and said abutment, and means to respectively cause said headtomove in opposite directions at a predetermined time, to open and closesaid valve.

3. In a device of the character stated, a valve, a timin shaft rotatablymounted in operative relatlon thereto, a head, means to guide said head,a spindle connected to said valve and freely movable in said head, meansactuated by the movement of said shaft for alternately opening andclosing said valve and means independent thereof and coacting with saidspindle to maintain said valve seated after a closing movement.

WILLIAM D. KELLY.

Witnesses:

ROBERT M. BARR, C. D. MOVAY.

